i might be losing my mind lol, but aint 81-93 brake line's the same? I found a set of pbr brand front brake line's for my 81 d150 for cheap but they are for 89 d150, aint they all the same??

IIRC, no.

IIRC it all changed when mopar moved fuel lines to driver side for the tbi engine and droped the mech fuel pump.

Easiest way would be call a parts store and get both part numbers. Or just go to their website. Don't see why a fuel line would change brake lines

If your refering to the rubber line I just did a quick seach ot autozone and 78 is the same as 90.

should be the same. when I started driving my '87, I replaced all the brake liones. when I did my V8 swap in my '88 last month, I swapped the '87 lines on my '88. same same.

That's only a yr different lol.

ok lol well I was on rock auto an seen 1 of there brake line's fit 72-90 IIRC I was just not sure if there was a thread difference, would like to swap the brake line's while I got the front clip off the 2wd.. thanks again guy's

Why would fuel lines make a difference with the brake lines?

The only changes I could think of for brake lines was if the line fittings at the master changed when they changed the master cylinders. Seems I remember needing to add an adapter to one of the master cylinder fittings because the old one was too small (or was it too big ). Unfortunately, I've swapped so many masters and brake lines through the years, I have no idea what was swapped to what anymore. Gene